1/** 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16import { HiLog } from '../../../../../../common/src/main/ets/util/HiLog'; 17 18const TAG = 'BasicDataSource'; 19 20export class BasicDataSource implements IDataSource { 21 private listeners: DataChangeListener[] = [] 22 23 public totalCount(): number { 24 return 0 25 } 26 27 public getData(index: number): any { 28 return undefined 29 } 30 31 registerDataChangeListener(listener: DataChangeListener): void { 32 if (this.listeners.indexOf(listener) < 0) { 33 HiLog.i(TAG, 'BasicDataSource add listener '); 34 this.listeners.push(listener); 35 } 36 } 37 38 unregisterDataChangeListener(listener: DataChangeListener): void { 39 const pos = this.listeners.indexOf(listener); 40 if (pos >= 0) { 41 HiLog.i(TAG, 'BasicDataSource remove listener '); 42 this.listeners.splice(pos, 1); 43 } 44 } 45 46 notifyDataReload(): void { 47 this.listeners.forEach(listener => { 48 listener.onDataReloaded(); 49 }) 50 } 51 52 notifyDataAdd(index: number): void { 53 this.listeners.forEach(listener => { 54 listener.onDataAdd(index); 55 }) 56 } 57 58 notifyDataChange(index: number): void { 59 this.listeners.forEach(listener => { 60 listener.onDataChange(index) 61 }) 62 } 63 64 notifyDataDelete(index: number): void { 65 this.listeners.forEach(listener => { 66 listener.onDataDelete(index); 67 }) 68 } 69 70 notifyDataMove(from: number, to: number): void { 71 this.listeners.forEach(listener => { 72 listener.onDataMove(from, to); 73 }) 74 } 75} 76 77export default BasicDataSource